We can look back on results that suited us but what's good for us isn't necessarily "good".
The concept of good requires a subject and a frame of reference. The only way that your claim can be true is if you change the frame of reference after assessing what is good for us and before assessing if it is good in some other way.
Humans as a species become the object of assessment.
Some species, sure. But other species survive by being more specialized. Shouldn't that put them on a "higher scale of fitness" too?
Again it is the reference frame. In 1850 we might have said that the passenger pigeon was equally fit as the shark, crocodile or cockroach. Today we see that this was not the case. Isn't this an objective assessment?
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